jq command

# To output a JSON file, in pretty-print format:
jq . <file.json>
# To output all elements from arrays (or all key-value pairs from objects) in a JSON file:
jq .[] <file.json>
# To read JSON objects from a file into an array, and output it (inverse of jq .[]):
jq --slurp . <file.json>
# To output the first element in a JSON file:
jq .[0] <file.json>
# To output the value of a given key of the first element in a JSON text from stdin:
cat <file.json> | jq .[0].<key_name>
# To output the value of a given key of each element in a JSON text from stdin:
cat <file.json> | jq 'map(.<key_name>)'